Nguyen Hy Nhan — CV & Portfolio

About Me

I'm a mobile game developer with 7 years of professional experience, mainly in Unity (C#) and Cocos2d-x (C++). At Senspark I have shipped more than 15 titles on Android, iOS, and the web, from casual puzzles and card games to a 3D first-person sandbox and Bombcrypto, a real-time multiplayer game with 5M+ users. I grew from developer to Tech Lead, and I have worked on every layer of a live game: client, game server, native plugins, and infrastructure. That gives me a systems view of how a client-side feature behaves on real devices and real networks.

Much of my work is taking a game design and turning it into stable, smooth features: porting large C++ codebases to Unity without changing the player experience, building tools so designers can create content on their own, and tuning performance on low-end and high-end phones alike.

Japanese games are the reason I make games. Harvest Moon (Bokujō Monogatari) and Pokémon (Gen 1–3) shaped my childhood. Today I bring that spirit into my own game, Nakamauchi: a retro virtual pet inspired by Tamagotchi, with a 1-bit handheld look, chiptune music, and fourteen "-chan" pets to raise. I'm now looking to join a larger team that builds large-scale mobile games with the care and polish of Japanese studios, and to contribute solid client-side engineering from day one.

Core Skills

Game Engines: Unity (C#) — 7 years, primary engine · Cocos2d-x (C++) · Cocos Creator (TypeScript) · Phaser (TypeScript)
Programming Fundamentals: OOP, data structures & algorithms (e.g. Monte Carlo bot AI, level-authoring tools), design patterns (MVC, Command, Strategy, interface-driven design with constructor injection)
Systems & Architecture: Modular client architecture; untangling legacy code and fixing memory leaks; porting large C++ (Cocos2d-x) codebases to Unity with full feature parity; owning a live product across client, server, and infrastructure
Performance: Profiling, optimization, and debugging on a wide range of Android & iOS devices; draw-call reduction through mesh combining and UI atlas optimization
Client / Server & Multiplayer: Real-time PvP netcode (input commands, state reconciliation, latency compensation); game servers with SmartFoxServer (Kotlin/Java) and Node.js
Native Integration: Custom native plugins for Android (Java/Kotlin) and iOS (Objective-C/Swift); SDK integration for ads, analytics, attribution, and IAP
Math & Graphics: 3D math for ball physics and collisions (Billiard Pool); custom shaders (e.g. animated lava shader, Hero Rescue, 2022)
Also: Technical leadership & project coordination · AdMob, AppLovin MAX, AppsFlyer · ReactJS (TypeScript) · Solidity · PostgreSQL, Redis, Docker, Nginx

Work Experience

Senspark — Game Developer → Tech Lead

Jul 2020 – Present

•Shipped more than 15 titles on Android, iOS, and the web (key projects listed below); built many of them alone from start to release.
•Ported several Cocos2d-x (C++) titles to Unity (C#) — four card games, Gold Miner, Tank 1990 — fully replacing the C++ versions while keeping the same player experience.
•On Bombcrypto (5M+ users), grew from client developer in a 10-developer team to Lead Developer, and today the sole developer owning its client, server, blockchain, and DevOps.
•Owned technical direction as Tech Lead: architecture, code standards, and hands-on support for the studio's Unity developers.
•Since 2025, also lead the mobile game teams (1–4 developers): task breakdown, scheduling, final QA, and test automation.
•Integrated ads, attribution, and IAP SDKs (AdMob, AppLovin MAX, AppsFlyer) across the studio's portfolio, writing native Android/iOS plugins where needed.

DTP Education Software — Game Developer

Sep 2019 – Jul 2020

•Built 2D educational games for Android TV Box using Unity and Cocos Creator.

Featured Project — Bombcrypto

Ranked among the top crypto games worldwide

Bombcrypto

2022 – Present

Unity (C#) · Web (WebGL) · Team: Up to 10 developers → about 4 → 1 · Role: Client Developer → Lead Developer → Sole Developer

Online multiplayer blockchain game (play-to-earn) with Adventure (PvE) and real-time PvP modes. Reached 5M+ users and ranked among the top crypto games worldwide, with continuous updates for over four years.

•Joined as a client developer (Unity, plus the React web frontend) while the whole studio was focused on this product, with up to 10 developers across client, server, and blockchain.
•As the studio downsized, became Lead Developer of the remaining team of about four developers.
•Designed the real-time PvP netcode: Command pattern for player inputs, pluggable latency-measurement strategies (mean / median / min), client–server state reconciliation with delta diffing, and lag compensation using clock-offset estimation.
•Built scalable infrastructure for 3,000+ CCU, deployed across South America and Southeast Asia.
•Today the sole developer owning the whole product: Unity client, Kotlin game server (SmartFoxServer), Solidity smart contracts, and DevOps.
•Cut cloud infrastructure cost from $100/day to near $0 by moving from Kubernetes to self-hosted Docker servers.

Result: Drove the studio's breakthrough growth in 2023; still live today.

Tech: Unity, C#, Kotlin, SmartFoxServer, ReactJS, Node.js, TypeScript, Solidity, PostgreSQL, Redis, Docker

Open-source code: Unity client — github.com/Senspark/bombcrypto-client-v2 · Kotlin server — github.com/Senspark/bombcrypto-server-v2

Featured Personal Project — Nakamauchi

Nakamauchi — Retro Virtual Pet

2026 – Present

Phaser (TypeScript) · Android & iOS · Team: Solo developer + commissioned pixel artist · Role: Creator & Developer

A love letter to Tamagotchi and Japanese handheld games: raise one of 14 "-chan" pets (Maruchan, Kitsunechan, Shirochan…) from an egg, inside a 1-bit LCD screen framed like a pocket device, with pixel art and chiptune music. The name joins two Japanese words: nakama (companions) and uchi (home).

•Designed and built the game: care loop (feeding, sleep schedule, sickness), branching evolution with hidden quests and a collection book, room decoration, and 8 mini-games (fishing, maze, jump rope, cooking, racing, adventure map and more).
•Added social features: friends, gifts, and leaderboards.
•Released on Google Play, with the iOS version in TestFlight.

Result: 36% D1 retention among players from the first ad campaign.

Tech: Phaser, TypeScript

play.google.com/store/apps/details?id=xeko.app.nakamauchi

Key Projects at Senspark (2020 – Present)

Senspark's published games on Google Play: play.google.com/store/apps/dev?id=7830868662152106484 (some older titles below have been removed from the store).

Relax Sort Puzzle

2026 – Present

Unity (C#) · Android & iOS · Team: 4 developers · Role: Tech Lead

Casual match-3 sorting puzzle: players clear shelves by grouping three identical items.

•Broke down features and assigned work across the 4-developer team; tracked the schedule to keep milestones on time.
•Owned final QA before each release and automated the testing process.

Result: Reached 50% D1 retention; still in active development.

Tech: Unity, C#

Zen Fish

2026

Unity (C#) · Android & iOS · Team: 3 developers · Role: Tech Lead

Meditation app combined with a virtual aquarium game, where players care for their own fish pond.

•Broke down features and assigned work to each of the 3 developers; tracked progress against the schedule.
•Owned final QA before release and automated the testing process.

Result: Did not reach the expected traction; no longer in active development.

Tech: Unity, C#

Build Block Craft

2022 – Present

Unity (C#) · Android & iOS · Team: 3 developers · Role: Tech Lead (since 2025)

3D first-person block-building sandbox with adventure and shooting gameplay.

•Since 2025, leading the team of three: planning and splitting development work.
•Untangled a messy legacy codebase: removed static variables used everywhere, which kept objects alive so the garbage collector could not free them, and rewrote inefficient code paths.
•Reduced draw calls on mobile through mesh combining and UI atlas optimization.

Result: One of the studio's top-grossing titles; development scaled back in 2026.

Tech: Unity, C#, 3D

Bombsquad

2023 – Present

Unity (C#) · Android & iOS · Team: 2 developers · Role: Developer (Performance & Ads)

Classic bomb-placing arcade battle game.

•Cleaned up legacy code: removed widespread static references that caused memory leaks, and rewrote slow code paths.
•Reduced draw calls, build size, and cold-start time on mobile devices.
•Optimized ad integration (AdMob, AppLovin MAX mediation) to protect the game's ad revenue.

Result: Top-3 grossing title in the studio at its peak; no longer in active development.

Tech: Unity, C#

Stick Dynasty

2023 – 2025

Unity (C#) · Android & iOS · Team: 2 developers · Role: Server Developer

Tower-defense strategy game with stickman armies.

•Built the real-time PvP game server with Kotlin and SmartFoxServer.
•Players were spread across many regions, so latency to a single server region hurt the real-time experience; the team decided to remove the PvP mode.

Result: The studio's #1 grossing title at its peak; active development stopped in 2025.

Tech: Unity, C#, Kotlin, SmartFoxServer

Galaxy Shooter Battle 2025

2023 – 2025

Unity (C#) · Android & iOS · Team: 2 developers · Role: Developer

Classic space shooter in the bullet-hell style.

•Designed and built a level editor so game designers could create stages on their own, without code changes.

Result: Moderate revenue; no longer in active development.

Tech: Unity, C#, Unity Editor tooling

Billiard Pool

2023 – 2024

Unity (C#) · Android & iOS · Team: Solo · Role: Sole Developer

Pool game with puzzle-style levels.

•Built the entire gameplay.
•Implemented the 3D math for ball movement and collisions.

Result: Below expectations; discontinued.

Tech: Unity, C#, 3D math

Fish Hunter

2023 – 2024

Unity (C#) · Android & iOS · Team: Solo · Role: Sole Developer

Offline casual fish-shooting arcade game, designed without gambling mechanics.

•Built the entire gameplay.

Result: Discontinued after new government regulations on this game category.

Tech: Unity, C#

Tank 1990

2024 – 2025

Unity (C#) · Android & iOS · Team: Solo · Role: Sole Developer

Remake of the classic 8-bit tank battle shooter.

•Ported the game from Cocos2d-x (C++) to Unity (C#).

Result: The Unity version fully replaced the C++ version; no longer in active development.

Tech: Unity, C#, Cocos2d-x, C++

Gold Miner series — Đào Vàng™, Gold Miner Classic: Gold Rush, Gold Miner World Tour

2021 – 2025

Cocos2d-x (C++), Unity (C#), Cocos Creator (TypeScript) · Android & iOS · Team: Solo · Role: Sole Developer

Level-based casual game: grab as much gold as possible before time runs out.

•Ported Gold Miner Classic: Gold Rush from Cocos2d-x (C++) to Unity (C#), released as Đào Vàng™.
•Reworked the game from landscape to portrait orientation.
•Added live-ops features: events, leaderboards, teams, and chat.
•Built a Playable Ad for user acquisition on the AppLovin and Unity networks.
•Built a separate title, Gold Miner World Tour, in Cocos Creator (TypeScript).

Result: The studio's #1 grossing title at the time; no longer in active development.

Tech: Unity, C#, Cocos2d-x, C++, Cocos Creator, TypeScript

Vietnamese Card Games — Tiến Lên Miền Nam, Phỏm (Tá Lả), Mậu Binh, Hong Kong Poker

2020 – 2024

Cocos2d-x (C++) → Unity (C#) · Android & iOS · Team: Solo · Role: Sole Developer

Four separate card games (four codebases) with Vietnamese rules, played offline against bots driven by a Monte Carlo AI.

•2020 – 2021 (Cocos2d-x / C++): developed new game modes on top of the existing codebases.
•2021 – 2024: ported all four games to Unity (C#), including the Monte Carlo bot AI, while keeping the exact player experience of the C++ versions.

Result: Top-3 grossing group in the studio; the Unity versions fully replaced the C++ ones. Active development stopped in 2024 due to new government regulations on card games.

Tech: Unity, C#, Cocos2d-x, C++, Monte Carlo search

Education & Learning

•Studied Information Technology at Nha Trang University
•Self-taught on the job: game engines (Unity, Cocos2d-x, Cocos Creator), game servers (Kotlin, Node.js), DevOps (Docker), and smart contracts (Solidity), each learned when a product needed it.